package com.junshang.JUC_day1;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * Created by sahngjun on 2017/3/21.
 */
public class TestProductorAndConsumer {
    public static void main(String[] args) {
        Clerk clerk = new Clerk();
        Productor productor = new Productor(clerk);
        Consumer consumer = new Consumer(clerk);

        new Thread(productor, "生产者A").start();
        new Thread(consumer, "消费者B").start();

        new Thread(productor, "生产者C").start();
        new Thread(consumer, "消费者D").start();
    }
}

//店员
class Clerk {
    private int product = 0;
    private Lock lock = new ReentrantLock();
    private Condition condition = lock.newCondition();

    //进货
    public void get() {
        lock.lock();
        try {
            while (product >= 1) {  //为了避免虚假唤醒问题，应该总是使用在循环中才行
                System.out.println("产品已满");
                try {
                    this.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            System.out.println(Thread.currentThread().getName() + "：" + ++product);
            this.notifyAll();
        } finally {
            lock.unlock();
        }
    }

    //买货
    public void sale() {
        lock.lock();
        try {
            while (product <= 0) {
                System.out.println("缺货");
                try {
                    this.wait();//等待并释放资源，解锁
                } catch (InterruptedException e) {
                }
            }
            System.out.println(Thread.currentThread().getName() + ":" + --product);
            this.notifyAll();
        } finally {
            lock.unlock();
        }
    }
}

class Productor implements Runnable {
    private Clerk clerk;

    public Productor(Clerk clerk) {
        this.clerk = clerk;
    }

    public void run() {
        for (int i = 0; i < 20; i++) {
            try {
                Thread.sleep(200);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            clerk.get();
        }
    }
}

class Consumer implements Runnable {
    private Clerk clerk;

    public Consumer(Clerk clerk) {
        this.clerk = clerk;
    }

    public void run() {
        for (int i = 0; i < 20; i++) {
            clerk.sale();
        }
    }
}